What can I do to reduce the tremendous amount of dust in my home?

I live in a Sears kit home, which also has a 2 car garage attached. Our bedroom is over the garage. Ever since we’ve moved here, I’ve been battling huge amounts of dust. It clings to everything and hangs down cobwebs from the ceiling. It seems that every two weeks my cleaning is undone. I’ve had my ducks cleaned twice and change the air filters in my two HVAC units. Advice? It’s everywhere!

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